In 1988, the U.S. Army Corps of Engineers began an investigation of the benefits and costs of extending several locks on the lower portion of the Upper Mississi

This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work was reproduced

The Mississippi River is, in many ways, the nation's best known and most important river system. Mississippi River water quality is of paramount importance for